/*
 Copyright 2020 Adobe. All rights reserved.
 This file is licensed to you under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License. You may obtain a copy
 of the License at http://www.apache.org/licenses/LICENSE-2.0
 Unless required by applicable law or agreed to in writing, software distributed under
 the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS
 OF ANY KIND, either express or implied. See the License for the specific language
 governing permissions and limitations under the License.
 */

import Foundation

///
/// Constants for the FileUnzipper utility
///
enum FileUnzipperConstants {
    static let defaultReadChunkSize = UInt32(16 * 1024)
    static let defaultFilePermissions = UInt16(0o644)
    static let defaultDirectoryPermissions = UInt16(0o755)
    static let defaultPOSIXBufferSize = defaultReadChunkSize
    static let defaultDirectoryUnitCount = Int64(1)
    static let minDirectoryEndOffset = 22
    static let maxDirectoryEndOffset = 66000
    // Relevant signature addresses
    static let endOfCentralDirectorySignature = 0x0605_4B50
    static let localFileHeaderSignature = 0x0403_4B50
    static let dataDescriptorSignature = 0x0807_4B50
    static let centralDirectorySignature = 0x0201_4B50

    /// The lookup table used to calculate `CRC32` checksums.
    static let crcTable: [UInt32] = [
        0x0000_0000, 0x7707_3096, 0xEE0E_612C, 0x9909_51BA, 0x076D_C419,
        0x706A_F48F, 0xE963_A535, 0x9E64_95A3, 0x0EDB_8832, 0x79DC_B8A4,
        0xE0D5_E91E, 0x97D2_D988, 0x09B6_4C2B, 0x7EB1_7CBD, 0xE7B8_2D07,
        0x90BF_1D91, 0x1DB7_1064, 0x6AB0_20F2, 0xF3B9_7148, 0x84BE_41DE,
        0x1ADA_D47D, 0x6DDD_E4EB, 0xF4D4_B551, 0x83D3_85C7, 0x136C_9856,
        0x646B_A8C0, 0xFD62_F97A, 0x8A65_C9EC, 0x1401_5C4F, 0x6306_6CD9,
        0xFA0F_3D63, 0x8D08_0DF5, 0x3B6E_20C8, 0x4C69_105E, 0xD560_41E4,
        0xA267_7172, 0x3C03_E4D1, 0x4B04_D447, 0xD20D_85FD, 0xA50A_B56B,
        0x35B5_A8FA, 0x42B2_986C, 0xDBBB_C9D6, 0xACBC_F940, 0x32D8_6CE3,
        0x45DF_5C75, 0xDCD6_0DCF, 0xABD1_3D59, 0x26D9_30AC, 0x51DE_003A,
        0xC8D7_5180, 0xBFD0_6116, 0x21B4_F4B5, 0x56B3_C423, 0xCFBA_9599,
        0xB8BD_A50F, 0x2802_B89E, 0x5F05_8808, 0xC60C_D9B2, 0xB10B_E924,
        0x2F6F_7C87, 0x5868_4C11, 0xC161_1DAB, 0xB666_2D3D, 0x76DC_4190,
        0x01DB_7106, 0x98D2_20BC, 0xEFD5_102A, 0x71B1_8589, 0x06B6_B51F,
        0x9FBF_E4A5, 0xE8B8_D433, 0x7807_C9A2, 0x0F00_F934, 0x9609_A88E,
        0xE10E_9818, 0x7F6A_0DBB, 0x086D_3D2D, 0x9164_6C97, 0xE663_5C01,
        0x6B6B_51F4, 0x1C6C_6162, 0x8565_30D8, 0xF262_004E, 0x6C06_95ED,
        0x1B01_A57B, 0x8208_F4C1, 0xF50F_C457, 0x65B0_D9C6, 0x12B7_E950,
        0x8BBE_B8EA, 0xFCB9_887C, 0x62DD_1DDF, 0x15DA_2D49, 0x8CD3_7CF3,
        0xFBD4_4C65, 0x4DB2_6158, 0x3AB5_51CE, 0xA3BC_0074, 0xD4BB_30E2,
        0x4ADF_A541, 0x3DD8_95D7, 0xA4D1_C46D, 0xD3D6_F4FB, 0x4369_E96A,
        0x346E_D9FC, 0xAD67_8846, 0xDA60_B8D0, 0x4404_2D73, 0x3303_1DE5,
        0xAA0A_4C5F, 0xDD0D_7CC9, 0x5005_713C, 0x2702_41AA, 0xBE0B_1010,
        0xC90C_2086, 0x5768_B525, 0x206F_85B3, 0xB966_D409, 0xCE61_E49F,
        0x5EDE_F90E, 0x29D9_C998, 0xB0D0_9822, 0xC7D7_A8B4, 0x59B3_3D17,
        0x2EB4_0D81, 0xB7BD_5C3B, 0xC0BA_6CAD, 0xEDB8_8320, 0x9ABF_B3B6,
        0x03B6_E20C, 0x74B1_D29A, 0xEAD5_4739, 0x9DD2_77AF, 0x04DB_2615,
        0x73DC_1683, 0xE363_0B12, 0x9464_3B84, 0x0D6D_6A3E, 0x7A6A_5AA8,
        0xE40E_CF0B, 0x9309_FF9D, 0x0A00_AE27, 0x7D07_9EB1, 0xF00F_9344,
        0x8708_A3D2, 0x1E01_F268, 0x6906_C2FE, 0xF762_575D, 0x8065_67CB,
        0x196C_3671, 0x6E6B_06E7, 0xFED4_1B76, 0x89D3_2BE0, 0x10DA_7A5A,
        0x67DD_4ACC, 0xF9B9_DF6F, 0x8EBE_EFF9, 0x17B7_BE43, 0x60B0_8ED5,
        0xD6D6_A3E8, 0xA1D1_937E, 0x38D8_C2C4, 0x4FDF_F252, 0xD1BB_67F1,
        0xA6BC_5767, 0x3FB5_06DD, 0x48B2_364B, 0xD80D_2BDA, 0xAF0A_1B4C,
        0x3603_4AF6, 0x4104_7A60, 0xDF60_EFC3, 0xA867_DF55, 0x316E_8EEF,
        0x4669_BE79, 0xCB61_B38C, 0xBC66_831A, 0x256F_D2A0, 0x5268_E236,
        0xCC0C_7795, 0xBB0B_4703, 0x2202_16B9, 0x5505_262F, 0xC5BA_3BBE,
        0xB2BD_0B28, 0x2BB4_5A92, 0x5CB3_6A04, 0xC2D7_FFA7, 0xB5D0_CF31,
        0x2CD9_9E8B, 0x5BDE_AE1D, 0x9B64_C2B0, 0xEC63_F226, 0x756A_A39C,
        0x026D_930A, 0x9C09_06A9, 0xEB0E_363F, 0x7207_6785, 0x0500_5713,
        0x95BF_4A82, 0xE2B8_7A14, 0x7BB1_2BAE, 0x0CB6_1B38, 0x92D2_8E9B,
        0xE5D5_BE0D, 0x7CDC_EFB7, 0x0BDB_DF21, 0x86D3_D2D4, 0xF1D4_E242,
        0x68DD_B3F8, 0x1FDA_836E, 0x81BE_16CD, 0xF6B9_265B, 0x6FB0_77E1,
        0x18B7_4777, 0x8808_5AE6, 0xFF0F_6A70, 0x6606_3BCA, 0x1101_0B5C,
        0x8F65_9EFF, 0xF862_AE69, 0x616B_FFD3, 0x166C_CF45, 0xA00A_E278,
        0xD70D_D2EE, 0x4E04_8354, 0x3903_B3C2, 0xA767_2661, 0xD060_16F7,
        0x4969_474D, 0x3E6E_77DB, 0xAED1_6A4A, 0xD9D6_5ADC, 0x40DF_0B66,
        0x37D8_3BF0, 0xA9BC_AE53, 0xDEBB_9EC5, 0x47B2_CF7F, 0x30B5_FFE9,
        0xBDBD_F21C, 0xCABA_C28A, 0x53B3_9330, 0x24B4_A3A6, 0xBAD0_3605,
        0xCDD7_0693, 0x54DE_5729, 0x23D9_67BF, 0xB366_7A2E, 0xC461_4AB8,
        0x5D68_1B02, 0x2A6F_2B94, 0xB40B_BE37, 0xC30C_8EA1, 0x5A05_DF1B,
        0x2D02_EF8D,
    ]
}
